Xbase++

Convert Inline Data-URL Images to Related Parts

Demonstrates the Chilkat Email.ConvertInlineImages method, which converts images embedded inline within HTML (as base64 data URLs) into multipart/related MIME parts referenced from the HTML by cid:. This example sets an HTML body containing a data-URL image and converts it.

Background: HTML can embed an image two ways: as a data: URL (the base64 bytes sit right in the src attribute) or as a related part referenced by cid:. Many email clients don't render data: URLs for security reasons, so converting them to proper multipart/related parts — the traditional email way to embed images — greatly improves how reliably the images display.

Chilkat Xbase++ Downloads

Download Chilkat for Xbase++

Xbase++

LOCAL nSuccess
LOCAL oEmail

nSuccess := 0

//  Demonstrates the ConvertInlineImages method, which converts images embedded inline within
//  HTML (as base64 data URLs) into multipart/related MIME parts referenced from the HTML by
//  CID.

oEmail := CreateObject("Chilkat.Email")
oEmail:Subject := "Convert inline images"

//  An HTML body with a base64 data-URL image (a 1x1 PNG).
oEmail:SetHtmlBody('<html><body><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mP8z8BQDwAEhQGAhKmMIQAAAABJRU5ErkJggg=="/></body></html>')

? "NumRelatedItems before = " + Str(oEmail:NumRelatedItems)

//  Convert the inline data-URL image(s) to multipart/related parts referenced by CID.

nSuccess := oEmail:ConvertInlineImages()
IF (nSuccess == 0)
    ? oEmail:LastErrorText
    oEmail:destroy()
    RETURN
ENDIF

? "NumRelatedItems after = " + Str(oEmail:NumRelatedItems)

oEmail:destroy()